For malware, MalwareBytes is the thing to use; if that somehow doesn't fix it (or can't install/update, in which case you have a nasty infection), and you're running a 32-bit OS, you can try ComboFix.
Read the FAQ for combo fix before you run it. Make *sure* you have a 32-bit OS before you run it Read the FAQ for combo fix before you run it; and lastly, if you screw something up, I am not responsible for any damages you may accrue via the use of combo fix.
Combo Fix is serious business, and will likely crush whatever it is that you have; but at the same token, it can ruin your OS and other things if you misuse it, so pay attention if you do use it.